209912472 has 240 divisors, whose sum is σ = 747358920. Its totient is φ = 54432000.

The previous prime is 209912471. The next prime is 209912473. The reversal of 209912472 is 274219902.

It is an interprime number because it is at equal distance from previous prime (209912471) and next prime (209912473).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209912471) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 348972 + ... + 349572.

Almost surely, 2^209912472 is an apocalyptic number.

209912472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209912472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373679460).

209912472 is an abundant number, since it is smaller than the sum of its proper divisors (537446448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209912472 is a wasteful number, since it uses less digits than its factorization.

209912472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 209912472 is about 14488.3564285256. The cubic root of 209912472 is about 594.3096029114.

The spelling of 209912472 in words is "two hundred nine million, nine hundred twelve thousand, four hundred seventy-two".